Abstract: A charge pump circuit that can be used in a phase-locked loop circuit provides a differential output signal that has a common mode voltage. The charge pump includes a common mode feedback circuit that maintains a predetermined common mode voltage on output connection of the charge pump. The charge pump can operate with a small supply voltage. In one embodiment, the charge pump can operate with a supply voltage that is less than 2.0 volts and maintain a common mode voltage that is less than 1.0 volts. The common mode feedback circuit includes current mirror circuitry and bias circuitry. The current mirror circuitry and the bias circuitry adjust the common mode voltage in response to input signals.